[sdiy] Combined output / headphone jack?

[Benjamin Tremblay]

Oooh. Saving this in my handy notes.

> On Oct 15, 2024, at 8:21 AM, Mattias Rickardsson <mr at analogue.org> wrote:
> 
> On Mon, 14 Oct 2024 at 22:09, Neil Harper via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>> wrote:
>> looks like the stereo output and headphones are being driven by the same
>> circuit, NE5532's with 220 ohm series resistors. and if I understand the
>> normalizing properly, the "shorting" situation I was worried about only
>> happens if the LEFT/PHONES output is used with a TS cable without a
>> cable in the RIGHT/MONO jack. even then there's still the 220 ohm series
>> resistor in place so it's not even a short.. wonder if the 5532 would care?
> 
> On Tue, 15 Oct 2024 at 00:48, grant musictechnologiesgroup.com <http://musictechnologiesgroup.com/> <grant at musictechnologiesgroup.com <mailto:grant at musictechnologiesgroup.com>> wrote:
>> The Pro-One has a mono-for-stereo-headphones/audio output jack, again
>> with the NE5532:
>> Stereo headphones can be plugged directly into the AUDIO OUT jack. The
>> headphones should have a minimum impedance of 600 Ohms,"
> 
> As you have pointed out, the signal on the ring will need to handle being permanently shorted to ground if a TS plug is connected.
> 
> Many typical headphones will be around 100-200-300 ohms. Feels a bit underspecified to use an op-amp with 500-1000 ohm load capabilities here, perhaps worth making a proper headphone stage for these outputs?
> 
> /mr
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